package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

/**
 * TODO
 *
 * @author wxc
 * @date 2023/8/16 15:23
 */
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

  @Autowired private ShoppingCartMapper shoppingCartMapper;
  @Autowired private DishMapper dishMapper;
  @Autowired private SetmealMapper setmealMapper;
  /**
   * 添加购物车
   *
   * @param shoppingCartDTO
   */
  @Override
  public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

    ShoppingCart shoppingCart = new ShoppingCart();
    BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

    // 只能查询自己的购物车数据
    shoppingCart.setUserId(BaseContext.getCurrentId());

    // 判断当前商品是否在购物车中
    List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

    if (shoppingCartList != null && shoppingCartList.size() == 1) {
      // 如果已经存在，就更新数量，数量加1
      shoppingCart = shoppingCartList.get(0);
      shoppingCart.setNumber(shoppingCart.getNumber() + 1);
      shoppingCartMapper.updateNumberById(shoppingCart);
    } else {
      // 如果不存在，插入数据，数量就是1
      // 判断当前添加到购物车的是菜品还是套餐
      Long dishId = shoppingCartDTO.getDishId();
      if (dishId != null) {
        // 添加到购物车的是菜品
        Dish dish = dishMapper.getById(dishId);
        shoppingCart.setName(dish.getName());
        shoppingCart.setImage(dish.getImage());
        shoppingCart.setAmount(dish.getPrice());
      } else {
        // 添加到购物车的是套餐
        Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
        shoppingCart.setName(setmeal.getName());
        shoppingCart.setImage(setmeal.getImage());
        shoppingCart.setAmount(setmeal.getPrice());
      }
      shoppingCart.setNumber(1);
      shoppingCart.setCreateTime(LocalDateTime.now());
      shoppingCartMapper.insert(shoppingCart);
    }
  }

  /**
   * 查看购物车
   * @return
   */
  @Override
  public List<ShoppingCart> showShoppingCart() {
    List<ShoppingCart> shoppingCarts = shoppingCartMapper.list(ShoppingCart.builder()
            .userId(BaseContext.getCurrentId())
            .build());
    return shoppingCarts;
  }

  /**
   * 删除购物车
   */
  @Override
  public void cleanShoppingCart() {
    shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
  }
}
